Answer:
36
Step-by-step explanation:
The angles of a pentagon sum to 180(5-2) = 540 degrees, so each angle of a regular pentagon is 540/5 = 108. Therefore, three of these angles sum to $3 * 108 = 324, which means the indicated angle measures 360 - 324 = 36.
First I would find the base, which is a square so 10x10=100
then find the triangle (a=1/2bh) a=1/2(12)(10) a=1/2(120) a=60
since there are four triangle sides do 60x4 which equals 240, so then add the sides to the base 100+240=340, the answer is A
Simplify what’s in the parenthesis:
3 - 4(7)
Multiply:
3 - 28
Simplify by subtracting:
-25
I'm pretty sure DEF is a scalene triangle since it looks like none of the sides are equal to each other.
Hope this helps!
May