What is this triangle?

equilateral triangle

obtuse triangle

scalene triangle

or isosceles triangle

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isosceles triangle

Step-by-step explanation:

If a triangle has at least two equal sides, the triangle is referred to as the isosceles triangle. In the given diagram, it is shown that the two sides are equal. Moreover, this type of triangle has two equal angles.

The equilateral triangle means the triangle is having three equal sides but no right angle. A scalene triangle indicates the triangle has three different sides.

Finally, the obtuse triangle means the triangle has at least one obtuse angle. That means one side has more than 90 degrees.

the triangle in the picture above is a isoscles triangle.

Step-by-step explanation:

an isosceles triangle has two sides that are the same length and two angles that are the same size.

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

cosine

step-by-step explanation: