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Hi Guys...Can Anyone Please Help With Answers and Reasons?​

Hi Guys...Can Anyone Please Help With Answers and Reasons?​-example-1
User Nfadili
by
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1 Answer

8 votes
8 votes

Answer:

1. a = 64°, b = 296°, c = 148°

2. a = 90°, b = 32°, c = 58°, d = 58°, e = 29°, f = 29°, g = 29°, h = 29°, i = 122°, j = 122°

3. a = 35°, b = 35°, c = 70°, d = 35°, e = 35°, f = 110°, g = 22°

4. a = 27°, b = 63°, c = 27°, d = 54°, e = 90°, f = 36°, g = 63°

5. t = 40°, u = 40°, v = 80°, w = 21°, x = 42°, y = 19°, z = 19°

Explanation:

On the same arc angle subtended at center is twice the angle subtended at circumference

same arc, same angle on any point on the circumference

1.

a = 2 * 32° = 64°

b = 360° - a = 360° - 64° = 296°

c = b/2 = 296°/2 = 148°

a = 64°, b = 296°, c = 148°

2.

a = 180 - 90 = 90°

triangle OMT and triangle ONT are congruent

b = 32°

c = 90 - 32 = 58°

d = c = 58°

f = c /2 = 58/2 = 29°

exterior angle, c = h + f

h = c - f = 58 - 29 = 29°

j = 180 - c = 180 - 58 = 122°

similarly, e = g = 29°, i = 122°

a = 90°, b = 32°, c = 58°, d = 58°, e = 29°, f = 29°, g = 29°, h = 29°, i = 122°, j = 122°

3.

a = 70/2 = 35°

As TR = VT, b = a = 35°

arc VTR, c = a + b = 35° + 35° = 70°

arc VT, d = a = 35°

TR = VT, e = d = 35°

cyclic quadrilateral, f + a + b = 180, f = 180 - a - b = 180 - 35 - 35 = 110°

arc PQ, g = angle PRQ = 22°

a = 35°, b = 35°, c = 70°, d = 35°, e = 35°, f = 110°, g = 22°

4.

arc PQ, a = 27°

b = 90 - 27 = 63°

MP is diameter, b + c = 90°, c = 90 - b = 90 - 63 = 27°

g = 90 - c = 90 - 27 = 63°

e = 180 - 90 = 90°

angle NPR = 90 - 27 = 63°

ON + OP, a + f = angle NPR = 63°, f = 63 - a = 63 - 27 = 36°

d = 90 - f = 90 - 36 = 54°

a = 27°, b = 63°, c = 27°, d = 54°, e = 90°, f = 36°, g = 63°

5.

arc BC, t = u = 40°

arc AB, w = 21°

arc BC, v = 2u = 2 * 40 = 80°

arc AB, x = 2 * 21 = 42°

OA = OC, y = z = ( 180 - x - v )/2 = ( 160 - 42 - 80 )/2 = 19°

t = 40°, u = 40°, v = 80°, w = 21°, x = 42°, y = 19°, z = 19°

User MrAutoIt
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