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標題:
maths! maths! maths!
發問:
p. 291. In the figure, AOB is a straight line. Which of the following is fasle?Figure : http://www.flickr.com/photos/29635386@N06/3750951111/a. [///] AOB=180度 b. x+y=180度 c. x=180度-y d. x=y-180度[///] : http://www.flickr.com/photos/29635386@N06/3751746870/ 2. In the figure, find b.Figure :... 顯示更多 p. 29 1. In the figure, AOB is a straight line. Which of the following is fasle? Figure : http://www.flickr.com/photos/29635386@N06/3750951111/ a. [///] AOB=180度 b. x+y=180度 c. x=180度-y d. x=y-180度 [///] : http://www.flickr.com/photos/29635386@N06/3751746870/ 2. In the figure, find b. Figure : http://www.flickr.com/photos/29635386@N06/3751741902/ a. 35度 b. 55度 c. 125度 d. 145度 3. In the figure, AB//CD. Find x. Figure : http://www.flickr.com/photos/29635386@N06/3751741856/ a. 30度 b. 45度 c.75度 d. 90度 4. In the figure, MBDN is a straight line and AB//CD. Find x. Figure : http://www.flickr.com/photos/29635386@N06/3750951135/ a. 30 b. 45 c . 75 d. 120 5. In the figure, PQRS is a parallelogram. Which of the following is false? Figure : http://www.flickr.com/photos/29635386@N06/3751741704/ a. b+c=180度 b. c+d=180度 c. b+d=180度 d. a+d=180度
最佳解答:
1. Option D is false. A. AOB is actually a straight line, so angle AOB = 180* B. x + y = 180* (adj. angles on st. line) C. Since x + y = 180*, we have x = 180* - y D. x = 180* - y, not x = y - 180* 2. The answer is C. a + 35* = 90* a = 90* - 35* = 55* a + b = 180* (adj. angles on st. line) 55* + b = 180* b = 180* - 55* = 125* 3. The answer is B. Since AB // CD So, x + 3x = 180* (int. angles, AB // CD) 4x = 180* x = 180* / 4 = 45* 4. The answer is B. Since AB // CD So, angle ABD = angle CDN = (2x - 5)* (corr. angles, AB // CD) Angle ABD + Angle ABM = 180* (adj. angles on st. line) (2x - 5)* + (2x + 5)* = 180* 4x* = 180* x = 45 5. The answer is C. A. b + c = 180* (alt. angles, PQ // SR) B. c + d = 180* (alt. angles, PS // QR) C. b should equal to d, and from the figure, both b and d are obtuse. So, b + d > 180*. D. Since b = d And a + b = 180* (adj. angles on st. line) So, a + d = 180*
其他解答:
maths! maths! maths!
發問:
p. 291. In the figure, AOB is a straight line. Which of the following is fasle?Figure : http://www.flickr.com/photos/29635386@N06/3750951111/a. [///] AOB=180度 b. x+y=180度 c. x=180度-y d. x=y-180度[///] : http://www.flickr.com/photos/29635386@N06/3751746870/ 2. In the figure, find b.Figure :... 顯示更多 p. 29 1. In the figure, AOB is a straight line. Which of the following is fasle? Figure : http://www.flickr.com/photos/29635386@N06/3750951111/ a. [///] AOB=180度 b. x+y=180度 c. x=180度-y d. x=y-180度 [///] : http://www.flickr.com/photos/29635386@N06/3751746870/ 2. In the figure, find b. Figure : http://www.flickr.com/photos/29635386@N06/3751741902/ a. 35度 b. 55度 c. 125度 d. 145度 3. In the figure, AB//CD. Find x. Figure : http://www.flickr.com/photos/29635386@N06/3751741856/ a. 30度 b. 45度 c.75度 d. 90度 4. In the figure, MBDN is a straight line and AB//CD. Find x. Figure : http://www.flickr.com/photos/29635386@N06/3750951135/ a. 30 b. 45 c . 75 d. 120 5. In the figure, PQRS is a parallelogram. Which of the following is false? Figure : http://www.flickr.com/photos/29635386@N06/3751741704/ a. b+c=180度 b. c+d=180度 c. b+d=180度 d. a+d=180度
最佳解答:
1. Option D is false. A. AOB is actually a straight line, so angle AOB = 180* B. x + y = 180* (adj. angles on st. line) C. Since x + y = 180*, we have x = 180* - y D. x = 180* - y, not x = y - 180* 2. The answer is C. a + 35* = 90* a = 90* - 35* = 55* a + b = 180* (adj. angles on st. line) 55* + b = 180* b = 180* - 55* = 125* 3. The answer is B. Since AB // CD So, x + 3x = 180* (int. angles, AB // CD) 4x = 180* x = 180* / 4 = 45* 4. The answer is B. Since AB // CD So, angle ABD = angle CDN = (2x - 5)* (corr. angles, AB // CD) Angle ABD + Angle ABM = 180* (adj. angles on st. line) (2x - 5)* + (2x + 5)* = 180* 4x* = 180* x = 45 5. The answer is C. A. b + c = 180* (alt. angles, PQ // SR) B. c + d = 180* (alt. angles, PS // QR) C. b should equal to d, and from the figure, both b and d are obtuse. So, b + d > 180*. D. Since b = d And a + b = 180* (adj. angles on st. line) So, a + d = 180*
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