2 Answers

Sjking · Answer 1 · 2020-07-08T12:18:50+0000

Answer:

Option C
$207\ units^(2)$

Explanation:

we know that

the surface area of a pyramid is equal to

SA=B+LA

where

B is the area of the base

LA is the lateral area

The area of the base B is

$B=9*9=81\ units^(2)$

The lateral area is equal to

$LA=4*(1/2)(9*7)=126\ units^(2)$

the surface area is equal to

$SA=81+126=207\ units^(2)$

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