A triangle and a parallelogram have the same base 28 cm and the same area. If the height of the parallelogram is 12 cm, then find the length of the altitude of the triangle.

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SSC CGL 2022 Tier-I Official Paper (Held On : 13 Dec 2022 Shift 2)
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  1. 28 cm
  2. 23 cm
  3. 24 cm
  4. 21 cm

Answer (Detailed Solution Below)

Option 3 : 24 cm
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Detailed Solution

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Given:

A triangle and a parallelogram have the same base 28 cm and the same area.

The height of the parallelogram is 12 cm.

Concept used:

1. Area of a parallelogram = Base × Height

2. Area of a triangle = 1/2 × Height × Base

Calculation:

Area of the parallelogram = 28 × 12 = 336 cm2

Let the length of the altitude of the triangle be H cm.

​According to the question,

1/2 × H × 28 = 336

⇒ H = 12 × 2

⇒ H = 24

∴ The length of the altitude of the triangle is 24 cm.

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