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Jenniferwolf
22.06.2019 •
Mathematics
At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec
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Ответ:
Angle 8 = 60°
Step-by-step explanation:
See the attached diagram.
The measurement of angle 2 is 60°.
Now, angle 2 = angle 4 as they are equal vertically opposite angles.
Hence, angle 4 = 60°
Now, horizontal lines AB ║ CD and the inclined line is the transverse line.
Hence, angle 4 and angle 8 are corresponding angles.
Therefore, angle 4 = angle 8 = 60° (Answer)