1 Answer

Harrisonlee · Answer 1 · 2020-03-19T15:50:30+0000

We can divide the pentagon into a rectangle (on the left) and a triangle (on the right)

The dimensions of the rectangle are 8x10 cm, so its area is

$8\cdot 10=80\text{ cm}^2$

The triangle has the same base as the rectangle, and its height is the difference between the sides of 15 and 10: the area is

$(8\cdot (15-10))/(2) = 4\cdot 5 = 20\text{ cm}^2$

So, the total area is

$80\text{ cm}^2+20\text{ cm}^2=100\text{ cm}^2$

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