[ 1.6-0.03]/2/2
= 1.3/4
=0.3925[ m]
2. The base of the sculpture is semicircular with a radius of 15m. It is planned to enclose it with stainless steel guardrail. How long is the stainless steel guardrail? How many square meters is this pedestal?
15*2 3. 14* 15*2/2
= 15*2 3. 14
= 15*5. 14
= 77. 1m
3. 14* 15* 15/2
=353.25 square meters
The diameter of the round flower bed is 20 meters. If a path 1 meter wide is built around the flower bed, what is the area of this path?
20/2 1*20/2 1*3. 14-20/2*20/2*3. 14
= 1 1* 1 1*3. 14- 10* 10*3. 14
=3. 14* 12 1- 100
=3. 14*2 1
=65.94 square meters
4. A trapezoid with an upper bottom of 8 cm and a lower bottom 12 cm, with a circle with a diameter of 8 cm in the middle. What is the area of the shaded part?
8 12*8/2
=80 square centimeters
3. 14*8/2*8/2
=50.24 square centimeters
80-50.24=29.76 cm2
5. A semicircular vegetable garden, 3 meters in diameter, how many square meters is the area of the vegetable garden?
3. 14*3/2*3/2/2
=3. 14* 1.5* 1.5/2
=3.5325 square meters
6. The radius of the circular lawn is 40m, and a cement road with a width of10m is built around the lawn. What is the area of this road?
3. 14*40 10*40 10-3. 14*40*40
=3. 14*50*50-3. 14*40*40
=3. 14*2500- 1600
=3. 14*900
=2926 square meters