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Right Angled Triangles
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A right angled triangle is (you guessed it), a triangle
which has a right angle (90°) in it.
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The little square in the corner tells us
that it is a right angled triangle (I wrote 90°, but you don't need to!) |
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Two Types
There are two types of right angled triangle:
- An isosceles right angled triangle
- A scalene right angled triangle
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Isosceles right angled triangle
One right angle
Two other equal angles always of 45°
Two equal sides
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Scalene right angled triangle
One right angle
Two other unequal angles
No equal sides
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The 3,4,5 Triangle
The "3,4,5 Triangle" has a right angle:
(It is a scalene right angled triangle)
A very useful triangle to draw if you need a right angle! |
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