# Triangle - 7th grade (12y) - math problems

#### Number of problems found: 197

- Is right triangle

One angle of the triangle is 36° and the remaining two are in the ratio 3:5. Determine whether triangle is a rectangular triangle. - Triangle

Can an equilateral triangle have a right angle? - 3-bracket 3

Two angles in a triangle are 90° and 60°. Has triangle at least two equal sides? - It is rectangular?

Size of two of the angles in a triangle are: α=110°, β=40°. Is it a right triangle? - Triangle

For how many integer values of x can 16, 15 and x be the lengths of the sides of triangle? - Is right triangle or not

If right triangle ABC, have sides a=13, b=11.5, c=22.5. Find area. - Isosceles triangle

The circumference of the isosceles triangle is 32.5 dm. Base length is 153 cm. How long is the leg of this triangle? - Right triangle

Right triangle ABC with side a = 19 and the area S = 95. Calculate the length of the remaining sides. - Is right?

Is a triangle with sides 51, 56, and 77 right triangle? - Inner angles

The magnitude of the internal angle at the main vertex C of the isosceles triangle ABC is 72°. The line p, parallel to the base of this triangle, divides the triangle into a trapezoid and a smaller triangle. How big are the inner angles of the trapezoid? - Area of a triangle

What is the area of a triangle that has the base 4 1/4 and the height of 3 3/3? - Midpoints

Triangle whose sides are midpoints of sides of triangle ABC has a perimeter 45. How long is perimeter of triangle ABC? - Angles in triangle

Calculate the alpha angle in the triangle if beta is 61 degrees and 98 gamma degrees. - EQL triangle

Calculate inradius and circumradius of equilateral triangle with side a=77 cm. - Similar triangles

In the triangle DEF is DE = 21cm, EF = 14.7cm, DF = 28cm. The triangle D´E´F´ is similar to the triangle DEF. Calculate the lengths of the sides of the triangle D´E´F´ if the similarity coefficient is one-seventh. - Triangle angles

The angles α, β, γ in triangle ABC are in the ratio 6:2:6. Calculate size of angles. - Type of triangle

How do I find the triangle type if the angle ratio is 2:3:7 ? - Triangles

Equilateral triangle with side 40 cm has the same perimeter as an isosceles triangle with arm of 45 cm. Calculate the base x of an isosceles triangle. - Triangle radians

The size of two internal angles of a triangle ABC are α=6/18π and β=7/18π. Calculate the size of the third angle. - XY triangle

Determine the area of a triangle given by line 7x+8y-69=0 and coordinate axes x and y.

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See also our trigonometric triangle calculator. Triangle Problems. Examples for 7th grade (seventh).