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= 1/2 x alas x tinggi
= 1/2 x 42 x 40
=840 cm²
L lingkaran
= πr²
= 22/7 x 21²
=22/7 x 441
=22 x 63
= 1386
karena stengah lingkaran, maka 1386/2 =693 cm²
LΔ + L stngah lingkaran = 840 cm² +693 cm² = 1.533 cm²
smoga bermanfaat !! ;)