What is the LATERAL surface area of the rectangular pyramid below???
2 answers:
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
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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