I was trying to make a "/\" frame and was trying to figure out what the angle had to be to have the 2 pieces join at the top.

I actually used trig to calculate what I "thought" would be the correct angle(didn't know i would actually *use* that stuff i learned in school!)

I have encountered 2 problems so perhaps someone can help me figure this out.

Here are the specifics. I am trying to join 2 pieces of 1/2" thick plywood(about 4"wide) to create some shade for a few plants that don't like direct sun.

They will span a planter that is 19.5" wide.

I want the tip of the V to be 23" tall.

First, please check my math.

I want the 2 pieces to meet in the middle, so the length of the base is 9.75" (19.5/2)

the height will be 23"

tan@=opp/adj 23/9.75=2.359 arctan 2.359=67 degrees

so, the angle between the planter and the /__ member is 67 degrees(internal angle)

there is my first problem....how do I cut a 67 degree angle? (complement of 67 is 23....do i need to cut a 23 degree angle?)

I figured the angle at the top of the /\ to be 23 degrees

tan#=opp/adj 9.75/23=.424 arctan.424= 23

23 degrees between the 2 members

does this mean i need to cut 23/2(11.5 degrees) at each end?

when i did this, the two members did not meet at the top.

what am i doing wrong?

also, how do i cut angles >45 degrees on the 2424 table saw?

thanks for your help

I actually used trig to calculate what I "thought" would be the correct angle(didn't know i would actually *use* that stuff i learned in school!)

I have encountered 2 problems so perhaps someone can help me figure this out.

Here are the specifics. I am trying to join 2 pieces of 1/2" thick plywood(about 4"wide) to create some shade for a few plants that don't like direct sun.

They will span a planter that is 19.5" wide.

I want the tip of the V to be 23" tall.

First, please check my math.

I want the 2 pieces to meet in the middle, so the length of the base is 9.75" (19.5/2)

the height will be 23"

tan@=opp/adj 23/9.75=2.359 arctan 2.359=67 degrees

so, the angle between the planter and the /__ member is 67 degrees(internal angle)

there is my first problem....how do I cut a 67 degree angle? (complement of 67 is 23....do i need to cut a 23 degree angle?)

I figured the angle at the top of the /\ to be 23 degrees

tan#=opp/adj 9.75/23=.424 arctan.424= 23

23 degrees between the 2 members

does this mean i need to cut 23/2(11.5 degrees) at each end?

when i did this, the two members did not meet at the top.

what am i doing wrong?

also, how do i cut angles >45 degrees on the 2424 table saw?

thanks for your help

## Comment