CAIE IGCSE Mathematics Extended E6.5.2 Use the Formula Area of Triangle 2 1 Ab Sin C Questions

Practise Extended CAIE IGCSE Mathematics by applying 1/2ab sin C to triangle areas, reversing the formula for an angle, and combining component areas in quadrilateral or field problems with correct units.

Exam points

Calculate a triangle’s area from two sides and their included angle using 1/2ab sin C.
Reverse 1/2ab sin C to find an acute or obtuse angle from a given area.
Combine sine-area calculations across triangles, quadrilaterals or field contexts and carry units through the result.

[Maximum number: 2]

Figure for Question CAIE IGCSE Mathematics Extended E6.5.2 Use the Formula Area of Triangle 2 1 Ab Sin C Questions question 1 — CAIE IGCSE Mathematics Extended

The area of the triangle is $50\text{ cm}^2$ .
Calculate the value of $\sin x$ .
$\sin x=$

0.427 or 0.4273 to 0.4274

M1 for $\frac12\times13\times18\times\sin x=50$ .

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CAIE IGCSE Mathematics Extended E6.5.2 Use the Formula Area of Triangle 2 1 Ab Sin C Questions question 1