1. Find the area (in cm²) of a triangle with base 12 cm and height 7 cm.   Hint Hint       2. Calculate the height (in cm to the nearest integer) of an equilateral triangle whose area is 36.95 cm².   Hint       3. Find the length of the hypotenuse (in cm) of an isosceles right-angled triangle having area of 484 cm².   Hint       4. The ratio of the areas of two triangles is 2 : 3. The ratio of their heights is 3 : 2. If the ratio of their bases is 4 : y, what is y?   Hint       5. Calculate the area (in cm² upto 1 decimal place) of an equilateral triangle of side 10 cm.   Hint       6. If the area of an equilateral triangle is 36√3 cm², find its perimeter (in cm).   Hint       7. The base of an isosceles triangle is 24 cm and perimeter is 64 cm. Find its area (in cm²).   Hint