Mathematics: The following picture is a square pyramid where DE=8 cm and m∠ADE=60°. Find the surface area of the pyramid in both exact form and approximate form.

20.49The nearest hundredth is the digit two places to the right of the decimal.So, 20.4945455 rounded to the nearest hundredth is 20.49...

The following picture is a square pyramid where

NatsuDDW

21.01.2022

131 cm

Step-by-step explanation:

formula for surface area of pyramid is

S = (1/3)Bh

but the base ia a square, so B = $x^{2}$

S = (1/3) $x^{2} h$

the pic shows h = 8

but we don't know x

do SohCahToa

sin60 = x/8

x = 8sin60

x = 6.92820323 or 7

plug in numbers

S = (1/3) $7^{2}$ 8

S = 392/3

S = 130.6666667 or 131 cm

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