Answer:
LSA = 592cm^2.
Step-by-step explanation:
Well LSA is the SA but without the base so the blue square does not count.
So we have to find the area of the triangle which is b*h/2.
So 18.5*16 / 2 is 148.
And since there is 4 triangles with the same dimensions we do 148*4, 592cm^2.
Answer:
-0.31.
Step-by-step explanation:
Cos (7π/5) is in the third quarter so the cosine is negative.
Cos 7π/5) = - cos (7π/5 - π)
= -cos 2π/5)
= -0.31.
