Answer:
b - 100 cm²
c - 45.5 cm²
Step-by-step explanation:
Hello There!
For b - The following figure shown is a trapezoid with the dimensions
height = 10cm
longer base = 12cm
shorter base = 8cm
We can calculate the area of a trapezoid using this formula
[tex]A=\frac{a+b}{2} h[/tex]
where a and b are bases and h = height
knowing the dimensions all we have to do is plug in the values
[tex]A=\frac{8+12}{2} 10\\8+12=20\\\frac{20}{2} =10\\10*10=100[/tex]
so we can conclude that the area of figure b is 100 cm²
for a
The figure shown is an irregular shape so to calculate the area we're going to want to divide the irregular shape into two regular shapes
a rectangle with the dimensions:
width = 7 cm
length = 8cm (total height of irregular figure) - 3cm (height of the triangle)
8cm-3cm=5cm so the length of the rectangle is 5cm
a triangle with the dimensions:
base (length) = 7cm
height = 3cm
Now lets find the area of each shape
for the rectangle:
the area of a rectangle can simply be found by multiplying the length and width
7 * 5 = 35 so the area of the rectangle is 35 cm²
for the triangle:
the area of a triangle can be found using this formula
[tex]A=\frac{1}{2} bh[/tex] where b = base and h = height
knowing the dimensions all we have to do is plug in the values
[tex]A=\frac{1}{2} 3*7\\3*7=21\\\frac{21}{2} =10.5[/tex]
so we can conclude that the area of the triangle is 10.5 cm²
finally we add the two areas of the regular shapes
10.5 + 35 = 45.5 cm²
In conclusion the area of the figure is 45.5 cm²
