The perpendicular sides of a right-angled triangle are $12$ and $15 \mathrm{cm}$ long. Another right-angled triangle of the same area has one of the perpendicular sides $18 \mathrm{cm}$ long. What is the length of the other side?

Compute the area in ${\mathrm{cm}}^2$ of the given figure.

Compute the area in ${\mathrm{cm}}^2$ of the given figure.

Compute the area in ${\mathrm{cm}}^2$ of the given figure.

Compute the area of the given figure in ${\mathrm{cm}}^2$.

Compute the area of the given figure in ${\mathrm{cm}}^2$.

A rectangular plot is $30 \mathrm{m}$ long and $10 \mathrm{m}$ wide. Within it, a triangular part is marked for planting plantain.

What is the area of this part in ${\mathrm{m}}^2$?

A rectangular plot is $30 \mathrm{m}$ long and $10 \mathrm{m}$ wide. Within it, a triangular part is marked for planting plantain.

What is the area of the triangular part in ${\mathrm{m}}^2$ to the right of the area for plantain?

A rectangular plot is $30 \mathrm{m}$ long and $10 \mathrm{m}$ wide. Within it, a triangular part is marked for planting plantain.

What is the area of the trapezium in ${\mathrm{m}}^2$ to the left of the plantain area?