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11.1 [ 4] in ABC, °, = 1 : 2 and AC = 4cms calculate the length of BC

Solution: In ABC, °,

= 1 : 2 = 90°, = 90° ]

= 90° ]

∠𝐁=𝟗𝟎°𝟑

=𝟑𝟎°

∠𝐁=𝟑𝟎°∠𝐂=𝟔𝟎°

𝐀𝐂=𝟒𝐜𝐦𝑨𝑩𝑪𝒊𝒔 𝒂𝟑𝟎° ,𝟔𝟎° ,𝟗𝟎 ° ,𝒕𝒓𝒊𝒂𝒏𝒈𝒍 𝒆

𝐢 .𝐞 .,𝐁𝐂=𝟐𝐀𝐂

𝐁𝐂=𝟐𝐱𝟒[𝐀𝐂=𝟒𝐜𝐦 ]

𝐁𝐂=𝟖𝐜𝐦

A

B C