7. The area of a rhombus is equal to the area of a triangle. If the base of the triangle is 28 cm, its corresponding
altitude is 18 cm and one of the diagonals of a rhombus is 21 cm, find its other diagonal.
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7. The area of a rhombus is equal to the area of a triangle. If the base of the triangle is 28 cm, its corresponding
altitude is 18 cm and one of the diagonals of a rhombus is 21 cm, find its other diagonal.
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Given :
The area of a rhombus is equal to the area of a triangle. Base of the triangle is 28 cm, its corresponding altitude is 18 cm and one of the diagonals of a rhombus is 21 cm.
To find :
Other diagonal of rhombus.
Solution :
Base of triangle = 28 cm
Corresponding altitude = 18 cm.
∴ Area of triangle = 1/2 × b × h
⇒ Area of triangle = 1/2 × 28 × 18
⇒ Area of triangle = 14 × 18
⇒ Area of triangle = 252 cm²
∵ Area of triangle = Area of rhombus.
∴ Area of rhombus = 252 cm²
Also, one diagonal of rhombus, d₁ = 21 cm
∵ Area of rhombus = 1/2 × d₁ × d₂
So atq,
⇒ 252 = 1/2 × 21 × d₂
⇒ 21d₂ = 252 × 2
⇒ 21d₂ = 504
⇒ d₂ = 504/21
⇒ d₂ = 24 cm.
∴ Other diagonal of rhombus = 24 cm.
Verified answer
Given :-
To Find :-
Solution :-
we know that,
so, the area of the triangle is 252 cm²
and we know that,
if ‘d1’ and ‘d2’ are two diagonals of the rhombus, then
hence, other diagonal of the rhombus is 24 cm