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Grade 5 - Mathematics
7.3 Kinds of Triangles

  • A three sided figure is called a triangle.
  • When we connect three points with line segments, a triangle is formed. We can refer to the triangle as triangle ABC. The points A, B, C are called the vertices of the triangle, and the segments AB, BC, and AC are called the sides.
  • A triangle that has two equal sides is called an isosceles triangle.
  • A triangle that has three sides equal is called an equilateral triangle.
  • A triangle that has one right angle is called a right angled triangle.
  • A triangle that has one obtuse angle is called an obtuse angled triangle.
  • A triangle that has one acute angle is called an acute angled triangle.

Directions: Answer the following questions. Also draw a triangle and name its angle, vertices and sides.
Q 1: A triangle that has one right angle is called a (an)
obtuse triangle
equilateral triangle
right triangle
isosceles triangle

Q 2: A triangle that has all three sides equal is called a (an)
isosceles triangle
obtuse triangle
right triangle
equilateral triangle

Q 3: A triangle is a geometric figure with ________ sides.
four
three
two
five

Q 4: What shape is formed by the 10 pins in a bowling alley?
Triangle
Rhombus
Square
Rectangle

Q 5: To construct a triangle you need ________.
a compass and a ruler
a ruler
a compass

Q 6: A triangle that has three equal sides is called a (an) _______ triangle.
equilateral
isosceles
congruent

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Question 8: This question is available to subscribers only!


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