Current location - Training Enrollment Network - Mathematics courses - Xiao Xin cut out a capital letter "A" with a red self-adhesive paper. How big is its area?
Xiao Xin cut out a capital letter "A" with a red self-adhesive paper. How big is its area?
trapeziform

S=(a+b)×h÷2

= 10+2× 12÷2

= 12× 12÷2

= 144÷2

=72

The triangle above

S=ah÷2

=3×4÷2

=6

Lower trapezoid

S=(a+b)×h÷2

=(4+6)×4÷2

=20

72-6-20=46

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