在锐角中,分别是角的对边,,. (1)求的值; (2)若,求的面积.

在锐角中,分别是角的对边,,.

(1)求的值; (2)若,求的面积.

答案

解：(1),又为锐角，，

，又为锐角，

。…6分

（2）由正弦定理得，.

由(1)知,, .

. ……12分

相关题目

徐中约《中国近代史》记载:民国的建立并没有带来和平、秩

徐中约《中国近代史》记载:民国的建立并没有带来和平、秩序和统一;相反,民国早期的特征是道德沦落、君主复辟运动、军阀割据,以及帝国主义势力加

I haven’t read ____ of his books, but judging from the one I have read I think

I haven’t read ____ of his books, but judging from the one I have read I think he’s a very promising writer. A、any B、none C、both D、either

某稀硫酸和稀硝酸的混合溶液 200mL，平均分成两份。向其中

某稀硫酸和稀硝酸的混合溶液 200mL，平均分成两份。向其中一份中逐渐加入铜粉，最多能溶解 l9.2g(已知硝酸只被还原为 NO气体，下同 )。向另一份中

已知以点为圆心的圆经过点和，且圆心在直线上. （Ⅰ）求圆

已知以点为圆心的圆经过点和，且圆心在直线上. （Ⅰ）求圆的方程；（Ⅱ）设点在圆上，求的面积的最大值.

--- Did you try to _______the manager to come to attend the lecture? --- Yes.

--- Did you try to _______the manager to come to attend the lecture? --- Yes. He _______, but he was too busy at that moment. A. recommend, meant to �

目前利用病毒杀虫制剂进行生物防治害虫尚有很大困难，主

目前利用病毒杀虫制剂进行生物防治害虫尚有很大困难，主要原因是（） A．施用病毒杀虫制剂易使施用者患病毒病 B．昆虫病毒不能大规模培养因

已知一条弧所对的圆周角的度数是15°，则它所对的圆心角的

已知一条弧所对的圆周角的度数是15°，则它所对的圆心角的度数是 .

—We really enjoy ourselves at the party. Thanks again, Mr. and Mrs. White. �

—We really enjoy ourselves at the party. Thanks again, Mr. and Mrs. White. —_____. Just drop in whenever you feel like it. A. With pleasure w.w.w.k.s.5 u.c.o.m �

在锐角中,分别是角的对边,,. (1)求的值; (2)若,求的面积.

答案

相关题目

最新题目