Answer:
322.5 in²
Step-by-step explanation:
1 base triangle + 3 top triangles
(½×15×13) + 3(½×10×15)
322.5
the answer is attached to the picture
2b + 2c
-70
102
triangle area = 180 degrees
straight line = 180 degrees
180 - 127 = 53
49
49 + 53 + 3rd angle = 180
3rd angle = 78
180-78 = x
x = 102
