The three sides of a triangle are \( 5 \mathrm{~cm}, 12 \mathrm{~cm} \) and 13 cm respectively. then , lis area is \( \begin{array}{llll}\text { A) } 10 \sqrt{3 \mathrm{CM}^{2}} & \text { B) } 10 \sqrt{6 \mathrm{CM}^{2}} & \text { C) } 20 \mathrm{CM}^{2} & \text { D) } 3\end{array} \)

1. If a rectangle has a length of 10 m and a height of 5 m , what is its perimeter?

If two vertically opposite angles are supplementary, then the measure of each angle of them equals \( \begin{array}{llll}\text { (a) } 45^{\circ} & \text { (b) } 60^{\circ} & \text { (c) } 90^{\circ} & \sqrt{3}\end{array} \)

8. Find the volume of the box (parallelepiped) determined by the points \( P=(1,2,4) \), \( Q=(2,-5,8), R=(4,2,-3) \) and \( S=(3,5,-6) \). 9. Find the volume of the box (parallelepiped) determined by the points \( P=(8,5,3) \), \( Q=(4,6,7), R=(-4,-2,9) \) and \( S=(3,-3,-4) \).

REVIEW EXERCISE FOR UNIT 4 Wrte true if the statement is correct and false if it is ont. a) Two congruent polygons are necessarily similar. b) Two similar polygons are necessarily congruent. c) Congruence is a similarity when the constant of proporicolity ts d) Rectangle ABCD is similar to rectangle EFGH if \( \frac{A B}{E F}=\frac{B C}{F G} \) c) Doubling the side length of a triangle doubles the area. f) Two tnangles with the same area are similar

Figure 4.27 The areas of two similar triangles are \( 64 \mathrm{~cm}^{2} \) and \( 144 \mathrm{~cm}^{2} \), a) Find the ratio of their altitudes. b) If the perimeter of the smaller triangle is 49 cm , find the perimeter of the larger triangle.