What is the Answer pls

A. Right angled Triangle

Step-by-step explanation:

The length and the width are not equal so we cannot have equilateral triangles,

An acute triangle is a triangle with three acute angles ( less than 90°) and since we have an angle that is 90° then the triangles are not acute.

An obtuse-angled triangle is a triangle in which one of the interior angles measures more than 90° degrees, which is NOT the case in our situation.

Therefore we have a right angled triangle since one angle=90°

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step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.