Angles index

Boats and Ships - acute and obtuse angles

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A right angle is 90. An acute angle is less than 90. It looks sharp (and we say that clever or sharp people are acute). An obtuse angle is greater than 90 but less than 180. This does not look sharp (and we say that people who don't understand something are obtuse). A reflex angle is greater than 180. This folds back on itself. You may think that it doesn't look like a real angle! A straight line is 180 and that definitely does not like like an angle.

Choose a picture. If you point or click on an angle in the picture, it will tell you what it is. Make sure that you point between the lines, not on them. There are lots of angles, some in the water or sky.
See how many angles of one type you can find. Then choose a type of angle to see if you got them all!

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Choose type of angle: