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Q.4 Find the missing values:

Answer :

(i) Area of the triangle = \(\frac{1}{2} \)× b × h
\(87cm^2 \) = \(\frac{1}{2} \) × 15 × h
Or, h = \(\frac{87×2}{15} \) = \(\frac{174}{15} \) = 11.6cm
(ii) Area of the triangle = \(\frac{1}{2} \)× b × h
\(1256cm^2 \) = \(\frac{1}{2} \) × b × 31.4
Or, b = \(\frac{1256×2}{31.4} \) = 40×2 = 80 mm
(iii) Area of the triangle = \(\frac{1}{2} \)× b × h
\(170.5cm^2 \) = \(\frac{1}{2} \) × 22 × h
Or, h = \(\frac{170.5×2}{22} \) = 15.5 cm