Centroid of a Trapezoid Formula

A trapezoid is a quadrilateral with two sides parallel. The centroid of a trapezoid lies between the two bases. For any trapezoid with parallel sides a and b, use below given formula.


Find below formula for the centroid of trapezoid located a distance of x,

\[\LARGE x = \frac{b+2a}{3(a+b)}h\]

h = height of trapezoid
a and b = P
arallel sides,

Solved Examples

Question 1: Find the centroid of trapezoid with the given dimensions?a = 12′ ; b = 5′ ; h = 5′

Solution: Given a = 12′; b = 5′; h = 5’Using centroid of trapezoid formula,

x = $\frac{b + 2a}{3(a + b)}$ h

x = $\frac{5 + 2 \times 12}{3(12 + 5)}$ 5

x = 2.84

Hence, the centroid of the trapezoid is 2.84

Example 2:

If the parallel sides of trapezoid measures 8 cm, 10 cm and the height is 9 cm, then find its centroid.


Let a and b be the parallel sides of a trapezoid.

According to the given,

a = 8 cm, b = 10 cm and h = 9 cm

Using the centroid of trapezoid formula,

\(x=\frac{b+2a}{3(a+b)}h\\=\frac{10+2(8)}{3(8+10)}9\\=\frac{26}{54}\times 9\\=\frac{13}{3}\\=4.33\)

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