Subject Experts Solutions for Chapter: Perimeter and Area, Exercise 7: Let Us Try 12.2

Find the area of the triangle whose base $=14 \mathrm{cm}$ and height $=6.5 \mathrm{cm}$.

Complete the following table.

The length of one of the sides of a parallelogram is $15.5 \mathrm{c}\mathrm{m}$. If the distance between this side and the opposite side is $16.5 \mathrm{c}\mathrm{m}$, find the area of the parallelogram.

The length of the base of a parallelogram is twice its height. If its area is $450 \mathrm{s}\mathrm{q} \mathrm{c}\mathrm{m}$, then find the base and the height of the parallelogram.

The perimeter of a parallelogram is $160 \mathrm{c}\mathrm{m}$. If one of the sides is longer than the other by $20 \mathrm{c}\mathrm{m}$, then find the length of each of its sides.

Two sides of a parallelogram are in the ratio of $7:3$. If its perimeter is $80 \mathrm{c}\mathrm{m}$, find the length of each of its sides.

The height of a triangle is thrice the length of its base. The length of the base of a triangle is $x \mathrm{c}\mathrm{m}$ and the length of the other two sides is $24 \mathrm{c}\mathrm{m}$ and $26 \mathrm{c}\mathrm{m}$. If the perimeter of the triangle is $60 \mathrm{c}\mathrm{m}$, find its height and area.

The base and the height of a triangle are in the ratio of $4:5$. If its area is $72.9 \mathrm{c}{\mathrm{m}}^2$, find the lengths of the base and the height of the triangle.