Find the area $ A $ of a pyramid if side $a = 7.8$ and slant height $s = 11.7$.

$A = 243.36$

STEP 1: find base area $ B $

To find base area $ B $ use formula:

$$ B = a^2 $$

After substituting $ a = 7.8 $ we have:

$$ B = 7.8^2 $$ $$ B = 60.84 $$

STEP 2: find lateral surface $ L $

To find lateral surface $ L $ use formula:

$$ L = 2 \cdot a \cdot s $$

After substituting $ a = 7.8 $ and $ s = 11.7 $ we have:

$$ L = 15.6 \cdot 11.7 $$$$ L = 182.52 $$

STEP 3: find total surface $ A $

To find total surface $ A $ use formula:

$$ A = B + L $$

After substituting $ B = 60.84 $ and $ L = 182.52 $ we have:

$$ A = 60.84 + 182.52 $$ $$ A = 60.84 + 182.52 $$ $$ A = 243.36 $$

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