Page 173 - Grade 10 C.Math

;dfwfg
oxfF lbOPsf]

A = 65°, C = 55°

xfdLnfO{ yfxf 5, A + B + C = 180°

cyjf, 65° + B + 55° = 180°

cyjf, B = 180° – 120° = 60°

k'gM AB = c = 8 cm /

BC = a = 12 cm

ABC sf] If]qkmn (A) = ?

xfdLnfO{ yfxf 5 ABC sf] If]qkmn (A) = a.c.SinB [a, c / B lbPsfdf ]

= x 8 x 12. Sin60°

= 4 x 12 x

Curriculum Development Centre
ju{ ;]=ld=

=
pbfx/0f 2
XYZ df X = 30°, y = 14 cm / z = 15 cm 5 eg] XYZ sf] If]qkmn slt xf]nf <
;dfwfg
oxfF XYZ df X = 30° y = 14 cm / z = 15 cm

XYZ sf] If]qkmn (A) = ?

XYZ sf] If]qkmn (A) = y.z. Sin X ju{ PsfO

= 14 x 15. Sin30° cm 2

= 7 x 15 x cm 2

= 52.5 cm 2

170 ul0ft, sIff – 10