BE = 16cm Exercise 5.3.1 1. Calculate the area and perimeter of the following triangles. a. b. 10cm 16cm 6 cm 10cm 10cm 5cm 7cm 2 2. The area of a triangle is 63 cm². If its height is 9cm long, then calculate the length of its base. 3. The figure below represents a wall of a certain building. Find the area and perimeter of the wall. 3m 3m Im ㅁ 176 Mathematics: Grade 7 4. Based on the figure below, answer the following questions 5m 3.7m Chapter 5 D 6cm E C 6cm a. Calculate the area of shaded region A B b. Calculate the area of unshaded part 12cm