A, B, C and D are points on the circumference of a circle, centre O. ED is a tangent to the circle.

E

Angle ODB = 25°

А

Work out angle BAD.

You must give a reason for each stage

of your working.

250

D

B

С

Total marks: 4

PLEASE HELPPP

Angle at BAD = 115°

Step-by-step explanation:

Angle at ODB = 25°

Step 1: Joining point B to the centre of the circle gives an equilateral triangle

Angle at OBD = 25° (base angles of an equilateral triangle are equal)

Angle at BOD = 180° - (25° + 25°) = 130° (sum of angles of a triangle = 180°)

Reflex angle at BOD = 360° - 130° = 230° (sum of angles at a point = 360°)

Step 2: Joining point B to A and point D to A gives another triangle

Angle at BAD = ½ × 230° = 115° (angle at centre is twice the angle at any point on the circumference)

Therefore, angle at BAD = 115°

69.64%

step-by-step explanation:

13.46

step-by-step explanation:

16.80 x .20 = 13.46