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CBSE Class 9 Answered

In given figure ABCD is a rhombus if angle A= 70,find angle CDB.
Image result for rhombus with one diagonal
Asked by gaurav72001 | 13 Feb, 2015, 09:25: PM
answered-by-expert Expert Answer
I n space triangle space C B A comma angle B C A equals angle B A C space equals 35 degree angle C B A equals 180 degree minus 2 cross times 35 equals 110 degree angle C D A plus angle C B A equals 360 degree minus 2 cross times angle D A B space left square bracket S I n c e space angle B C D equals angle B A D comma space i n space a space r h o m b u s right square bracket equals 360 degree minus 2 cross times 70 degree equals 220 degree angle C D A equals angle C B A equals 220 over 2 equals 110 degree D i a g o n a l s space i n space a space r h o m b u s space a r e space a n g l e space b i s e c t o r s. angle C D B equals 110 over 2 equals 55 degree
Answered by Prasenjit Paul | 14 Feb, 2015, 11:04: AM

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