Exam 6: Circles
-Supply missing statements and missing reasons for the following proof.
Given: In the circle,
Prove:
S1. R1.
S2. Draw
R2.
S3.
R3.
S4. R4. Congruent angles have equal measures.
S5. ? and ? R5. The measure of an inscribed angle equals one-half
the measure of its intercepted arc.
S6.
R6.
S7.
R7.
S8. R8.










S1. In the circle, R1. Given
R2. Through 2 points, there is exactly one line.
R3. If 2 parallel lines are cut ny a transversal, the alternate interior angles are congruent.
S4. S5.
and
R6. Substitution Property of Equality
R7. Multiplication Property of Equality
S8.
R8. If 2 arcs of a circle are equal in measure, these arcs are congruent.
-Supply missing statements and missing reasons for the following proof.
Given: Chords
and
intersect at point N in
Prove:
)
S1. R1.
S2. Draw
R2.
S3.
R3. The measure of an ext.
of a
is
the sum
of measures of the two nonadjacent int.
. S4.
and
R4.
S5. R5. Substitution Property of Equality
S6. R6. Substitution Property of Equality














S1. Chords and
intersect at point N in
R1. Given
R2. Through 2 points, there is exactly one line.
R4. In a circle, the measure of an inscribed angle is one-half that of its intercepted arc.
S5.
S6.
)
-Supply missing statements and missing reasons for the proof of the following theorem.
"An angle inscribed in a semicircle is a right angle."
Given:
with diameter
and
(as shown)
Prove:
is a right angle.
S1. R1.
S2.
R2.
S3. R3. The measure of a semicircle is 180.
S4.
or
R4.
S5. R5.








S1. with diameter
and
(as shown)
R1. Given
R2. The measure of an inscribed angle is on-half the degree measure of its intercepted arc.
S3.
R4. Substitution Property of Equality
S5. is a right angle.
R5. Definition of a right angle.
-Supply missing statements and missing reasons for the following proof.
Given: Chords
,
,
, and
as shown
Prove:
S1. R1.
S2.
R2.
S3. R3. If 2 inscribed
intercept the same arc, these
are
.
S4. R4.










-Use the drawing provided to explain why the following theorem is true.
"The tangent segments to a circle from an external point are congruent."
Given:
and
are tangent to
Prove:
[Hint: Use auxiliary line segment
.]
![-Use the drawing provided to explain why the following theorem is true. The tangent segments to a circle from an external point are congruent. Given: and are tangent to Prove: [Hint: Use auxiliary line segment .]](https://storage.examlex.com/TB7237/11eb4b36_76fe_33df_a05a_55181bd3fd53_TB7237_11.jpg)
![-Use the drawing provided to explain why the following theorem is true. The tangent segments to a circle from an external point are congruent. Given: and are tangent to Prove: [Hint: Use auxiliary line segment .]](https://storage.examlex.com/TB7237/11eb4b36_76fe_33e0_a05a_e760851bebfb_TB7237_11.jpg)
![-Use the drawing provided to explain why the following theorem is true. The tangent segments to a circle from an external point are congruent. Given: and are tangent to Prove: [Hint: Use auxiliary line segment .]](https://storage.examlex.com/TB7237/11eb4b36_76fe_5af1_a05a_e35fffdaf6a0_TB7237_11.jpg)
![-Use the drawing provided to explain why the following theorem is true. The tangent segments to a circle from an external point are congruent. Given: and are tangent to Prove: [Hint: Use auxiliary line segment .]](https://storage.examlex.com/TB7237/11eb4b36_76fe_5af2_a05a_338c546d8311_TB7237_11.jpg)
![-Use the drawing provided to explain why the following theorem is true. The tangent segments to a circle from an external point are congruent. Given: and are tangent to Prove: [Hint: Use auxiliary line segment .]](https://storage.examlex.com/TB7237/11eb4b36_76fe_5af3_a05a_d103c5d080c0_TB7237_11.jpg)
![-Use the drawing provided to explain why the following theorem is true. The tangent segments to a circle from an external point are congruent. Given: and are tangent to Prove: [Hint: Use auxiliary line segment .]](https://storage.examlex.com/TB7237/11eb4b36_76fe_5af4_a05a_2532aeee0240_TB7237_11.jpg)
-Supply missing statements and missing reasons for the following proof.
Given:
in
Prove:
is an isosceles triangle
S1. R1.
S2.
R2.
S3.
R3.
S4. ? and ? R4. The degree measure of an iscribed angle is equal to one-half
the degree measure of its intercepted arc.
S5.
R5.
S6. R6. Definition of congruent angles
S7. R7. If two angles of a triangle are congruent, then the two sides
that lie opposite those angles are also congruent.
S8. R8.










-Supply missing statements and missing reasons for the following proof.
Given:
; chords
and
intersect at point V
Prove:
S1. R1.
S2. Draw
and
. R2.
S3. R3. Vertical angles are congruent.
S4.
R4.
S5. R5. AA
S6.
R6.
S7. R7. Means-Extremes Property of a Proportion









-Supply missing reasons for the following proof.
Given:
with diameter
Prove:
S1.
with diameter
R1.
S2. Draw radius
R2.
S3.
R3.
S4.
R4.
S5.
R5.
S6.
R6.
S7.
or R7.
S8.
R8.
S9. But
R9.
S10. Then
R10.
















-Supply all statements and all reasons for the proof that follows.
Given:
;
Prove:






Explain why the following must be true.
Given: Points A, B, and C lie on
in such a way that
;
also, chords
,
, and
(no drawing provided)
Prove:
must be an isosceles triangle.







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