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Earn +20 ptsQ: Triangle number of 28
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Continue Learning about Math & Arithmetic
What number is a square and triangle number?
36 is both a square number and a triangle number as it is:6x6=36andthe square numbers are:1, 3, 6, 10, 15, 21, 28, 36, 45,55, 66, 78.xx
Is 28 a triangle number?
Yes, 28 is a triangular number. It is equal to 7 + 6 + 5 + 4 + 3 + 2 + 1, or (7 x 8) / 2.
Is 23 a triangle number?
No, 23 is not a triangular number. Here are a few examples of triangular numbers: 21, 28, 55, 45, 78 and 91.
The legs of a right triangle are 21 and 28 inches long What is the area of the triangle?
Area = 0.5*21*28 = 294 square inches
Is 12in 14 in 28 in a triangle?
No because 12+14 = 26 which is less than 28 and so therefore constructing a triangle is impossible.
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