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Naddika [18.5K]
4 years ago
7

I need to know the surface area. The formula is Area Of Base + Area of lateral faces

Mathematics
1 answer:
Vika [28.1K]4 years ago
8 0

Answer:

<h2>215.1 yd²</h2>

Step-by-step explanation:

We have three triangles with base b = 9yd and height h = 10yd, and one triangle in the base of pyramid with base b = 9yd and height h = 7.8yd.

The formula of an area of a triangle:

A_\triangle=\dfrac{bh}{2}

Substitute:

LA=4\cdot\dfrac{(9)(10)}{2}=(2)(90)=180\ yd^2\\\\B=\dfrac{(9)(7.8)}{2}=(9)(3.9)=35.1\ yd^2\\\\SA=B+LA\to SA=180+35.1=215.1\ yd^2

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