A right‑angled triangle has one leg of length 3 cm and the other leg of length 4 cm. What is its area?

medium 2 marks Class 3 · Mathematics · Shapes and Designs

Answer

6 cm²

The correct answer is 6 cm² — Step 6: State the final area as 6 cm².

Step-by-step solution

Step 1: Identify that the two given sides are the legs of a right‑angled triangle.
Step 2: Use the formula for area of a triangle: ½ × base × height.
Step 3: Take 3 cm as base and 4 cm as height: ½ × 3 cm × 4 cm.
Step 4: Compute the product: 3 cm × 4 cm = 12 cm².
Step 5: Divide by 2: 12 cm² ÷ 2 = 6 cm².
Step 6: State the final area as 6 cm².

Common mistake: Using base × height without dividing by 2.

Concept tested: Area of right‑angled triangle