Is Triangle?

First Angle: Second Angle: Third Angle Check

Trivia

1. What is the third angle for the triangle where angle1 = 45° and angle2 = 45°?

45 90 60 10
2. If a triangle has an angle of 90 degrees, what is it called?

Obtuse Acute Right angled Equilateral
3. Which of the following triangles have the same side lengths?

Scalene Isosceles Equilateral None
4. Area of an equilateral triangle with side length a is equal to?

√3/2a √3/2a ² √3/4a² √3/4 a
5. D and E are the midpoints of side AB and AC of a triangle ABC, respectively and BC = 6 cm. If DE || BC, then the length (in cm) of DE is:

2.5 3 5 6
6. The diagonals of a rhombus are 16 cm and 12 cm, in length. The side of rhombus in length is:

20cm 8cm 10cm 9cm
7. Corresponding sides of two similar triangles are in the ratio of 2:3. If the area of small triangle is 48 sq.cm, then the area of large triangle is:

230 sq.cm 106 sq.cm 107 sq.cm 108 sq.cm
8. If perimeter of a triangle is 100 cm and the length of two sides are 30 cm and 40 cm, the length of third side will be:

30 cm 40 cm 50 cm 60 cm
9. If triangles ABC and DEF are similar and AB=4 cm, DE=6 cm, EF=9 cm and FD=12 cm, the perimeter of triangle is:

22 cm 20 cm 21 cm 18 cm
10. The height of an equilateral triangle of side 5 cm is:

4.33cm 3.9cm 5cm 4cm