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180
Half of 360 degrees is 180 degrees.
Class 4 · English Version · Mathematics
Angles, triangles, quadrilaterals and symmetry
Explore angles, triangles, quadrilaterals and symmetry with an example and your own answers.
About this lesson and its coverage
Original Kidemy foundation practice · Read the example, write your answers, then check. This starter is shared across class versions; it is not a complete board-specific lesson or course.
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Learn the idea
A full turn is 360 degrees; a right angle is 90 degrees. A quadrilateral has four straight sides.
Worked example
A square has four equal sides and four right angles. An equilateral triangle has three equal sides.
- Read the example and explain which rule or evidence it uses.
- Try each task yourself, then compare the answer and its reason.
Your written practice
Show your working on paper. Check your answer, then choose Next.
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4
Quad refers to four.
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4
Two go through opposite side midpoints and two through opposite corners.
Take it further
Apply the idea in a new situation and explain your method. Open writing needs a guardian or teacher to review it.
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70
The angles sum to 180°; subtract 110°.
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2
The midlines parallel to its sides are symmetry lines; diagonals are not.
Write in your own words. A guardian or teacher should review this response.
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It has four right angles, so it meets the rectangle definition. Its sides are also all equal.
Describe the inclusive shape definition.
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