解涉及方位的二維空間應用題?
回答 (1)
2016-02-20 3:20 pm
(a)
OP
= (40 km/h) × (4 - 2 h)
= 80 km
PQ
= (40 km/h) × (5 - 4 h)
= 40 km
(b)
在 ΔOPQ 中：
OQ² = OP² + PQ² - 2 × OP × PQ × cos∠OPQ (餘弦定律)
OQ² = 80² + 40² - 2 × 80 × 40 × cos60° km²
OQ² = 4800 km²
OQ = 69.3 km
OP
= (40 km/h) × (4 - 2 h)
= 80 km
PQ
= (40 km/h) × (5 - 4 h)
= 40 km
(b)
在 ΔOPQ 中：
OQ² = OP² + PQ² - 2 × OP × PQ × cos∠OPQ (餘弦定律)
OQ² = 80² + 40² - 2 × 80 × 40 × cos60° km²
OQ² = 4800 km²
OQ = 69.3 km
收錄日期: 2021-04-18 14:28:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160220033937AAliNSw