How do you do circle theorems?

The angle at the centre is twice the angle at the circumference.

The angle in a semicircle is a right angle.

Angles in the same segment are equal.

Opposite angles in a cyclic quadrilateral sum to 180°

(hope this helps can I pls have brainlist (crown) ☺️)

Step-by-step explanation:

1. The angle at the centre is twice the angle at the circumference:

2. The angle in a semicircle is a right angle:

3. Angles in the same segment are equal:

4. Opposite angles in a cyclic quadrilateral sum to 180°:

5. The angle between the chord and the tangent is equal to the angle in the alternate segment:

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°