moose11111 moose11111
  • 04-05-2019
  • Mathematics
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I need to know the surface area. The formula is Area Of Base + Area of lateral faces
I will mark you brainliest

I need to know the surface area The formula is Area Of Base Area of lateral faces I will mark you brainliest class=

Respuesta :

gmany
gmany gmany
  • 05-05-2019

Answer:

215.1 yd²

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:

[tex]A_\triangle=\dfrac{bh}{2}[/tex]

Substitute:

[tex]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[/tex]

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