Which of the following statements is always true?

a.

obtuse triangles are acute.
b.

right triangles are isosceles.
c.

obtuse triangles are scalene.
d.

equilateral triangles are isosceles.

D. Equilateral triangles are isosceles.

Step-by-step explanation:

In geometry, an equilateral triangle is every triangle in which the three sides are equal [Euclidean geometry. , equilateral triangles are also equiangular, that is, all three internal angles are congruent with each other and measure.

It is important to remember that the equilateral triangle is named because it has 3 equal sides. Therefore, note that every equilateral triangle is also isosceles. This is because, looking only at two of its sides and ignoring the third, an isosceles triangle is observed.

b

step-by-step explanation:

given

- 2 (3x + 12y - 5 - 17x - 16y + 4 )

simplify the parenthesis by collecting like terms

= - 2 (- 14x - 4y - 1) ← distribute the parenthesis by - 2

= 28x + 8y + 2 → b

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