Rectangular 8365

The kit contains wooden prisms of various shapes. One is 4-sided with the base of a rectangular trapezoid (base measures 15cm and 27cm), arms 16cm and 20cm. The other was a 3-sided prism with base dimensions a=20cm, b=18cm, vb=30cm. Both prisms had a height of 10cm paint.

Correct answer:

S =  25.72 dm2

Step-by-step explanation:

a=15 cm c=27 cm b=16 cm d=20 cm  h=10 cm  z1=20 cm z2=18 cm h2=30 cm  S1=2 2a+c b+(a+b+c+d) h=2 215+27 16+(15+16+27+20) 10=1452 cm2  S2=2 2z2 h2+h (z1+z2+z1)=2 218 30+10 (20+18+20)=1120 cm2  S3=S1+S2=1452+1120=2572 cm2  S=S3 dm2=S3:100  dm2=2572:100  dm2=25.72 dm2=25643 dm2=25.72 dm2

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