Find the Mass of the Triangular Lamina with Vertices $( 0,0 ) , ( 20,40 ) \text {, and } ( 40,0 ) \text { for }$

Multiple Choice

Find the mass of the triangular lamina with vertices $( 0,0 ) , ( 20,40 ) \text {, and } ( 40,0 ) \text { for }$ the density $\rho=k$

A) 401k
B) 809k
C) 800k
D) 400k
E) 805k