Which of the following could NOT be the lengths of the sides of a triangle? A.5 in, 5 in, 5 in
B. 10 cm, 15 cm, 20 cm
C. 3 in, 4 in, 5 in
D. 8 ft, 15 ft, 5 ft

Given:

Sides of triangles in the options.

To find:

Which could NOT be the lengths of the sides of a triangle.

Solution:

Condition for triangle:

Sum of two smaller sides of a triangle must be greater than the longest side.

In option A,

Sides 5 in, 5 in, 5 in are the lengths of the sides of a triangle.

In option B,

Sides 10 cm, 15 cm, 20 cm are the lengths of the sides of a triangle.

In option C,

Sides 3 in, 4 in, 5 in are the lengths of the sides of a triangle.

In option D,

Since, the sum of two smaller sides is less than the longest side, therefore the sides 8 ft, 15 ft, 5 ft are not the lengths of the sides of a triangle.

Therefore, the correct option is D.

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step-by-step explanation:

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.