The diagram shows a triangle $$$A B C$$$, in which angle $$$A B C=90^{\circ}$$$ and $$$A B=4 \mathrm{~cm}$$$. The sector $$$A B D$$$ is part of a circle with centre $$$A$$$. The area of the sector is $$$10 \mathrm{~cm}^{2}$$$. Find angle $$$B A D$$$ in radians. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_s21_qp_13 Year：2021 Question No：5(a)

Answer:

$1 / 2 \times 4^{2} \times$ angle $B A D=10$
Angle $\mathrm{BAD}=1.25$

Knowledge points:

1.4.2 use the formulae in solving problems concerning the arc length and sector area of a circle (Including calculation of lengths and angles in triangles and areas of triangles.)

Answer:

Knowledge points:

Solution:

Related Question