Answer:
x= 5.656854
We show the first 6 decimal units if there is no metric being asked ie) centimetres or millimetres
x = a
a² = c ² - b ²
a² = 9² - 7²
√32 = √81 -√49
a² = √32 = 5.656854
Step-by-step explanation:
Have attached picture 7 that i promised from last question.
Also
Picture 8
= The angle at the centre is double the angle at the circumference.
Angle VWY = 1/2 of angle VOY = 1/2 x 180.
Picture 9 +10 ignore they are just for you to recognize 90 degree right angles so it can help you find x on tests/exams etc..
Picture 11 +12 are together the last ones ; if of interest is the hardest one.
Proof
Let angle CDE = x and angle EFC = y.
The angle at the centre is double the angle at the circumference.
Angle COE = 2y and the reflex angle COE = 2x.
Angles around a point add up to 360°.
2y + 2x = 360
2y/2+ 2x/2 = 360°/2
So y + x = 180°
