Question

Find the missing values: 

Base	Height	Area of triangle
15 cm		87 cm2
	31.4 mm	1256 mm2
22 cm		170.5 cm2

Answer 1

We know that the area of triangle 

= 1/2 x base x height

In first row,

base = 15 cm and area = 87 cm²

87 =1/2 x 15 x height

⇒ height =(87 x 2)/15

= 11.6 cm

In second row, height = 31.4 mm and area = 1256 mm²

\ 1256 = 1/2 x base x 31.4

⇒ base = (1256 x 2)/31.4

=80 mm

In third row,

base = 22 cm and area = 170.5 cm²

170.5 = 1/2 x 22 x height

⇒ height = (170.5 x 2) /22

=15.5 cm

Thus, the missing values are:

Base	Height	Area of triangle
15 cm	11.6cm	87 cm2
80 mm	31.4 mm	1256 mm2
22 cm	15.5cm	170.5 cm2