NZ Level 7 (NZC) Level 2 (NCEA)
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Area of a triangle - herons formula

Interactive practice questions

What is the area of the triangle with sides of length $5$5 cm, $6$6 cm and $5$5 cm?

a

First find the semi-perimeter $s$s.

b

Hence find the area using Heron's formula.

Easy
Approx 2 minutes
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Find the area of the triangle with side lengths of $5$5 cm, $5$5 cm and $8$8 cm.

Find the area of the triangle with side lengths of $6$6 cm, $5$5 cm and $9$9 cm.

Round your answer to two decimal places.

Find the area of the triangle.

Outcomes

M7-4

Apply trigonometric relationships, including the sine and cosine rules, in two and three dimensions

91259

Apply trigonometric relationships in solving problems

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