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Ramann03
09.12.2020 •
Mathematics
What is the area of a trapezoid ABCD with bases AB and CD , if: AB=10cm, BC=DA=13cm, CD=20cm I’ll give brainliest to correct answer
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Ответ:
180
Step-by-step explanation:
1. for the required area use the next formula:
where h is the height of the given trapezoid.
2. according to the attached scheme/picture the height is h=AH=BH₁
3. in ABH₁H:
AB║HH₁; AH║BH₁ and m(∠A)=m(∠B)=m(∠H)=m(∠H)=90°, then AB=H₁H=10 and CH=DH=(CD-AB)/2=(20-10)/2=5 cm.
4. in ΔADH:
m(∠H)=90°; AD=13 cm.; DH=5 cm., then AH=12 cm. But the height h is AH=12, then h=12.
5. after the substitution into the formula:
Ответ:
answer is not c. just took the test and c is incorrect
step-by-step explanation: