Solve for x a 12, b -10 ,c -12 ,d 12

Step-by-step explanation:

Remember that The sum of the interior angles of a triangle is two right angles ( 90 + 90 ) or 180 . Create an equation:

In the question, we are asked to find the value of x.

Now , Add the numbers : 60 and 40

Move 100 to RHS ( Right Hand Side ) and change it's sign

Subtract 100 from 180

Divide both sides by 8

The value of x is 10

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∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°