What is the LATERAL surface area of the rectangular pyramid below???

Mathematics

2 answers:

kherson [118]2 years ago

5 0

684 ft²

Area of rectangle :-

A = 18 ft * 20ft

A = 360 ft²

Area of 2 triangles :-

A = 2 * 8ft * 18 ft * 1/2

A = 144 ft²

Area of 2 triangles :-

A = 2 * 1/2 * 9ft * 20ft

A = 180 ft²

Total Area :-

A = ( 360 + 144 + 180 ) ft²

A = 684 ft²

emmasim [6.3K]2 years ago

4 0

Answer:

684 sq.ft

Step-by-step explanation:

(1) The base area of the pyramid is 18x20=360 sq.ft

(2) The Triangles of the pyramid:

1. There are two kinds of the triangles.

2. Smaller one: 18x8/2 (base times height divide 2)=72 sq.ft

3. Bigger one: 20x9/2=90 sq.ft

4. There are two of them so 72+72+90+90=324 sq.ft

And so 360+324=684 sq.ft.

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