Answer:
![= 4ab + 14b - 3a](https://tex.z-dn.net/?f=%20%3D%204ab%20%2B%2014b%20-%203a)
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Answer:
B
Step-by-step explanation:
A (w2-18=16)(w2-18=16) so, 16+16=32 (no)
B (w2+18=20)(w2-18=16) so, 20+16=36 (yes)
C (w2-6=4)(w2-6=4) so, 4+4=8 (no)
D (w2+6=8)(w2-6=4) 6+4=10 (no)
C=20ft x pie\2 +20ft x pie =20ft x 3pie\2
c=94.248ft
Answer:
See proof below
Step-by-step explanation:
Consider triangle with midpoints D, E, F of the sides BC, AC and AB, respectively. If D, E and F are midpoints of the sides BC, AC and AB, then
Triangle ABC is equilateral triangle, then
- m∠ABC=m∠ACB=m∠BAC=60°;
- AB=BC=AC.
If AB=BC=AC, then EA=CE=FA=BF=DC=DB.
By SAS theorem, ΔFAE≅ΔDCE≅ΔEBD.
Congruent triangles have congruent corresponding sides, then
EF=FD=DE. This means that triangle DEF is equilateral.