Question

Please I need help and an explanation :0

Answer 1

Angles drawn inside chords and radius hence they are equal

• 12x+15=3x+78
• 9x=63
• x=63/9
• x=7

Answer 2

`\qquad\qquad\huge\underline{{\sf Answer}}`

According to properties of arc on a circle, angles subtended by an arc on circle at its boundaries are equal to one another.

Hence ~

`\qquad \dashrightarrow \tt \: \angle C = \angle W`

`\qquad \tt \dashrightarrow \:12x + 15 = 3x + 78`

`\qquad \tt \dashrightarrow \:12x - 3x = 78 - 15`

`\qquad \tt \dashrightarrow \:9x = 63`

`\qquad \tt \dashrightarrow \:x = 63 / 9`

`\qquad \tt \dashrightarrow \:x = 7`

Therefore, value of x is 7