3 years ago

ABCD is a rectangle and BDis one of it's diagonals if ar (ABD)=8cm.Find ar (BCD )

Mathematics

1 answer:

Studentka2010 [4]3 years ago

7 0

This should be the answer

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A regular triangular pyramid has a base area of 31.5 mm2 and a surface area of

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Step-by-step explanation:

<u>Explanation</u>:-

Given A regular triangular pyramid has a base of area is 31.5mm^2

and also given surface area of triangular pyramid is 252 mm ^2

by using formula

surface area of regular triangular pyramid = base of area + half of lateral surface.

$surface area = area of the pyramid X \frac{1}{2} lateral surface$

252 = 31.5 + $\frac{1}{2} lateral surface$

$252-31.5= \frac{1}{2} lateral surface$

220.5 = lateral area of triangular pyramid

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