Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | E Maths
2 Answers Below
Anyone can contribute an answer, even non-tutors.
Help me wif (a) and (d). Thanks for help in advance !!
Date Posted: 4 years ago
Views: 255
a) because ∠ BAD = 90°
So it is an angle in a semicircle. So, BD must be the diameter of the circle and the length of the semicircle which passes through the centre.
OR
let X be the point where the line TB extends to.
∠ XBD = ∠ BAD = 90° (angles in alternate segments)
Since ∠XBD = 90° , and B is the tangent point of TX and DB,
DB must include the radius of the circle since tangent ∟ radius. So DB passes through the centre of the circle.
So it is an angle in a semicircle. So, BD must be the diameter of the circle and the length of the semicircle which passes through the centre.
OR
let X be the point where the line TB extends to.
∠ XBD = ∠ BAD = 90° (angles in alternate segments)
Since ∠XBD = 90° , and B is the tangent point of TX and DB,
DB must include the radius of the circle since tangent ∟ radius. So DB passes through the centre of the circle.
See 2 Answers
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Here
Date Posted:
4 years ago
360 Tutoring Program