1. The base of a right-angled triangle is 5 cm and its hypotenuse is 13 cm. Find the area (in cm²) of the triangle.   Hint Hint       2. Calculate the area (in cm² upto 1 decimal place) of an equilateral triangle of side 10 cm.   Hint       3. The difference between the sides of a right-angled triangle containing the right angle is 7 cm and its area is 60 cm². Calculate the perimeter (in cm) of the triangle.   Hint       4. Find the area (in m²) of an isosceles triangle, each of whose sides is 10 m and base 12 m.   Hint       5. Calculate the height (in cm to the nearest integer) of an equilateral triangle whose area is 36.95 cm².   Hint       6. The lengths of the sides of a triangle are in the ratio 3 : 4 : 5 and its perimeter is 72 cm. Find the area (in cm²) of the triangle.   Hint       7. Find the length of the hypotenuse (in cm) of an isosceles right-angled triangle having area of 484 cm².   Hint