Page 132 - NUMINO_WB_4A
P. 132
123_G4U6_WB˜ ˙—» ¿º 2011.3.30 5:31 PM ˘ ` 6 PDF_In 2540DPI 300LPI T
123-B3-2
3. Look at each clock. Determine whether the angle between the minute
hand and the hour hand is an acute angle or obtuse angle.
a. 12 : 12 b. 11 : 30
11 12 1 11 12 1
10 2 10 2
93 93
84 84
765 765
4. Each clock shows an angle made by the minute hand and the hour hand.
Find all the obtuse angles.
a. b.
c. d.
123-B3-2
3. Look at each clock. Determine whether the angle between the minute
hand and the hour hand is an acute angle or obtuse angle.
a. 12 : 12 b. 11 : 30
11 12 1 11 12 1
10 2 10 2
93 93
84 84
765 765
4. Each clock shows an angle made by the minute hand and the hour hand.
Find all the obtuse angles.
a. b.
c. d.
