Q.4 Find the missing values:

(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