We know that the area of triangle=12×base×height In first row, base=15cm and area=87cm2 ∴87=12×15× height ⇒ height=87×215=11.6cm In second row, height=31.4mm and area=1256mm2 ∴1256=12×base×31.4 ⇒base=1256×231.4=80mm In third row, base=22 cm and area=170.5cm2 ∴170.5=12×22×height ⇒ height=170.5×222=15.5cm Thus, the missing values are: