Topics
9. Geometry
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iGCSE (2021 Edition)

9.04 Triangles

Lesson
Worksheet
Practice

Interactive practice questions

Select the acute triangle:

A triangle with no tick marks on its sides, indicating that no sides are equal in length. One corner of the triangle has box drawn inside it, indicating a 90 degrees angle.

A

A triangle with no tick marks on its sides, indicating that no sides are equal in length. One of the interior angles measures more than 90° degrees and the other two is less than 90° degrees.

B

A triangle with no tick marks on its sides, indicating that no sides are equal in length. All angles appear to be less than 90 degrees.

C

A triangle with no tick marks on its sides, indicating that no sides are equal in length. One of the interior angles measures more than 90° degrees and the other two is less than 90° degrees.

D
Easy
< 1min

Select the obtuse triangle:

Easy
< 1min

Select the right-angled triangle:

Easy
< 1min

Select the isosceles triangle:

Easy
< 1min
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Outcomes

0580C4.1

Use and interpret the geometrical terms: point, line, parallel, bearing, right angle, acute, obtuse and reflex angles, perpendicular, similarity and congruence. Use and interpret vocabulary of triangles, quadrilaterals, circles, polygons and simple solid figures including nets.

0580C4.7C

Calculate unknown angles using angle properties of triangles and quadrilaterals.

0580E4.1

Use and interpret the geometrical terms: point, line, parallel, bearing, right angle, acute, obtuse and reflex angles, perpendicular, similarity and congruence. Use and interpret vocabulary of triangles, quadrilaterals, circles, polygons and simple solid figures including nets.

0580E4.7C

Calculate unknown angles using angle properties of triangles and quadrilaterals.

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