Question

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Answer 1

Answer:

ANSWER 12 --- 2*PI*R*H

ANSWER 13 --- Lsa of a square = 4a^2

                       = 4×5^2

                       =4×25

                       =100

ANSWER 14 --- AREA = ½ × d1 × d2

                         = 54CM^2

ANSWER 15 --- (i) 7x-5=16

                            7x=16+5

                            x=21/7

                            x = 3

                   

                        ii- 3x/2=16

                            3x=16*2

                            x=32/3

ANSWER 16 ---  ✔ 81^2 = (80 + 1)^2

                      using (a + b)^2 = a^2 + b^2 + 2ab

                    ✔ (80 + 1)^2

                      ➡ (80)^2 + (1)^2 + 2(80)(1)

                      ➡ 6400 + 1 + 160

                      ➡ 6561

ANSWER 17 --- volume of cylinder = πr²h

                      area of base = πr²

                      πr² = 250 m²

                      therefore, volume = 250 x h

                      = 250 x 2

                      = 500 m³

ANSWER 18 --- PERIMETER OF SQUARE = (SIDE)^2

                                                                    = (3)^2

                                                                    = 9

ANSWER 19 --- Area of trapezium = 1/2 × (sum of lengths of parallel sides) × height

                      Which implies

                      Area = 1/2 × 50 × 8

                      Area = 200 cm².

ANSWER 20 --- A rectangle by definition has 4 sides joined at 90 degrees. It has two longer sides and 2 shorter sides.

The Perimeter of a rectangle is defined as the sum of the lengths of all 4 sides. Therefore;

P = 2 * Long Side (8 cm) + 2 * Short Side (7 cm)

Or P = 2*8 + 2*7

Or P = 16 + 14

Or P = 30 cm

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