please solve it very urgent please
Answers
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