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Discover the different types of triangles and find out the difference between an equilateral, scalene, isosceles and right-angled triangle in this KS2 guide.
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- Equilateral, Isosceles and Scalene
- Play with It ...
- Area
There are three special names given to triangles that tell how many sides (or angles) are equal. There can be 3, 2 or noequal sides/angles: How to remember?Alphabetically they go 3, 2, none: 1. Equilateral: "equal"-lateral (lateral means side) so they have all equal sides 2. Isosceles: means "equal legs", and we have two legs, right? Also iSOSceles...
Try dragging the points around and make different triangles: You might also like to play with the Interactive Triangle.
The area is half of the base times height. 1. "b" is the distance along the base 2. "h" is the height (measured at right angles to the base) Area = ½ × b × h The formula works for all triangles. Note: a simpler way of writing the formula is bh/2 The base can be any side, Just be sure the "height" is measured at right angles to the "base": (Note: Yo...
- Right Triangles. A right triangle has one 90° angle and a variety of often-studied topics: Pythagorean Theorem. Pythagorean Triplets. Sine, Cosine, Tangent. Pictures of Right Triangles.
- Equilateral triangle. The Equilateral triangle shown on the left has three congruent sides and three congruent angles. Each angle is 60°.
- Isosceles triangle. The Isosceles triangle shown on the left has two equal sides and two equal angles.
- Scalene Triangle. The Scalene Triangle has no congruent sides. In other words, each side must have a different length.
An isosceles triangle with all angles less than 90° is an acute-angled triangle. An isosceles triangle with angles of 50°, 50° and 80° is an acute-angled triangle.
In an isosceles triangle, if two sides are equal, then the angles opposite to the two sides correspond to each other and are also always equal. In the given isosceles triangle ABC, the two angles ∠B and ∠C, opposite to the equal sides AB and BC, are equal to each other.
The types of triangles classified by their sides are the following: Equilateral triangle: A triangle with all three sides equal in measure. In Figure 1, the slash marks indicate equal measure. Figure 1 Equilateral triangle. Isosceles triangle: A triangle in which at least two sides have equal measure (Figure 2). Figure 2 Isosceles triangles
Isosceles triangle: If two sides of a triangle are equal, it is called an isosceles triangle. Scalene triangle: If all the sides of a triangle are of different lengths, it is called a scalene triangle.