# Triangle - 8th grade (13y) - math problems

#### Number of problems found: 671

• Medians in RT
The rectangular triangle ABC has a length of 10 cm and 24 cm. Points P, Q, R are the centers of the sides of this triangle. The perimeter of the PQR triangle is:
• Find the 9
Find the missing angle in the triangle and then name triangle. Angles are: 95, 2x+15, x+3
• Right triangle
A right triangle ABC is given, c is a hypotenuse. Find the length of the sides a, b, the angle beta if c = 5 and angle alfa = A = 35 degrees.
• Triangle
Calculate the sides of the triangle if its area S = 630 and the second cathethus is shorter by 17.
• 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.
• Sides od triangle
Sides of the triangle ABC has length 4 cm, 5 cm and 7 cm. Construct triangle A'B'C' that are similar to triangle ABC which has a circumference of 12 cm.
• Sides of triangle
Triangle has circumference 42 cm. Side a is 2 times shorter than side b and sice c is 2 cm longer than side a. Determine the sizes of sides of a triangle.
• EQL triangle
Calculate inradius and circumradius of equilateral triangle with side a=77 cm.
• The sides 3
The sides of an equilateral triangle are 9.4 cm, correct to the nearest one decimal place. Work out the upper bound of the side of this triangle.
• Chord of triangle
If the whole chord of the triangle is 14.4 cm long, how do you calculate the shorter and longer part?
• Equilateral triangle
Calculate the area of an equilateral triangle with circumference 72cm.
• Isosceles right triangle
Area of an isosceles right triangle is 18 dm2. Calculate the length of its base.
• Angles of the triangle
ABC is a triangle. The size of the angles alpha, beta are in a ratio 4: 7. The angle gamma is greater than the angle alpha by a quarter of a straight angle. Determine angles of the triangle ABC.
• Is right-angled
Can a triangle with the sides of sqrt 3, sqrt 5 and sqrt 8 (√3, √5 and √8) be a right triangle?
• Triangle
Calculate the area of right triangle ΔABC, if one leg is long 14 and its opposite angle is 59°.
• 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 ?
• Equilateral triangle v2
Equilateral triangle has a perimeter 36 dm. What is its area?
• Right triangle eq2
Hypotenuse of a right triangle is 9 cm longer than one leg and 8 cm longer than the second leg. Determine the circumference and area of a triangle.
• Right isosceles triangle
What can be the area of a right isosceles triangle with a side length of 8 cm?

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See also our trigonometric triangle calculator. Triangle Problems. Examples for 8th grade.