The diagonals of a rhombus are 19 cm and 29 cm. Find its area.
275.5 cm2
Area of a rhombus \(= \tfrac12 \times d_1 \times d_2\), with diagonals 19 cm and 29 cm.
So area \(= \tfrac12 \times 19 \times 29 = 275.5\) cm\(^2\).
Hence, the area of the rhombus is 275.5 cm\(^2\).
Calculate the area of the triangle whose sides are 8 cm, 9 cm and 13 cm. (Rounded up to two decimal places)