半径 69÷3.14÷2≈11厘米
面积 11^2×3.14=379.94平方厘米
猜你喜欢
- 1①长方形的周长是2c,若它的长为a,那么宽为?
- 2My car has broken down would you help me _____?a.
- 3I will love and honour him in sickness and in health until death do us part
- 4两堆煤,第二堆是第一堆的8分之5,第一堆运走了30%正好运走了12吨,第二堆多少吨?
- 5_____tell us more about tomorrow's weather,so plea
- 6要建造一座跨度为16米，拱高为4米的抛物线拱桥，建桥时，每隔4米用一根柱支撑，两边的柱长应为_米．
- 7120a的立方根是整数,求最小正整数
- 8现在牛津字典出到几了?
- 9同文同压下,0.5LCO2和2LHCL气体含有的分子数之比,物质的量之比,含有原子个数之比,气体密度之比为?
- 10No Matter What Happens,I' ll Always Be There for You!