Answer:
Step-by-step explanation:
Area of shapes
a) Triangle
base = b = 7 km
altitude or height = h = 3.8 km
[tex]\sf \boxed{\text{\bf Area of triangle =$\dfrac{1}{2}b*h$ }}[/tex]
[tex]= \dfrac{1}{2}*7*3.8\\\\= 7 * 1.9\\\\= 13.3 \ km^2[/tex]
b) Rectangle:
length = l = 8.2 cm
width = w = 7 cm
[tex]\sf \boxed{\text{\bf Area of rectangle = l*w}}[/tex]
= 8.2 * 7
= 57.4 cm²
c) Parallelogram
base = b = 9.1 km
height = h = 5 km
[tex]\sf \boxed{\text{\bf Area of parallellogram =b*h}}[/tex]
= 9.1 * 5
= 45.5 km²
d) Trapezium
Parallel sides a = 8.9 m & b = 2.7 m
height = h = 4.2 m
[tex]\sf \boxed{\text{\bf Area of trapezium =$\dfrac{(a +b)*h}{2}$}}[/tex]
[tex]\sf =\dfrac{(8.9+2.7)*4.2}{2}\\\\=\dfrac{11.6*4.2}{2}\\\\= 5.8 * 4.2\\\\= 24.36 \ m^2[/tex]
